public class q2 {
    public static final double PI = 3.14;
    public static void main(String[] args) {
        System.out.println("半径为1.2的圆的面积为："+ PI*1.2*1.2);
        System.out.println("半径为2.5的圆的面积为："+ PI*2.5*2.5);
        System.out.println("半径为6的圆的面积为："+ PI*6*6);
    }
}
